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A drive system for driving at least one compressor is described. The system comprises a gas turbine configured and arranged for driving the compressor. The gas turbine has a hot end and a cold end. A load coupling for connection of said gas turbine to the compressor is arranged at hot end of the gas

A drive system for driving at least one compressor is described. The system comprises a gas turbine configured and arranged for driving the compressor. The gas turbine has a hot end and a cold end. A load coupling for connection of said gas turbine to the compressor is arranged at hot end of the gas turbine. An electric motor/generator arranged at the cold end of the gas turbine. The electric motor/generator is electrically connected to an electric power grid and is adapted to function as a generator for converting excess mechanical power from the gas turbine into electrical power and delivering the electrical power to the electric power grid, and as a motor for supplementing driving power to the compressor.

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1. A drive system for driving a load, the drive system comprising: a compressor, wherein the load comprises the compressor;a gas turbine configured and arranged for driving the compressor, the gas turbine having a hot end and a cold end;a load coupling connecting the gas turbine to the compressor, a

1. A drive system for driving a load, the drive system comprising: a compressor, wherein the load comprises the compressor;a gas turbine configured and arranged for driving the compressor, the gas turbine having a hot end and a cold end;a load coupling connecting the gas turbine to the compressor, arranged at one of the hot end and the cold end of the gas turbine; andan electric motor/generator arranged at the other one of the hot end and the cold end of the gas turbine, the electric motor/generator electrically connected to an electric power grid and mechanically connected to the load coupling;wherein the electric motor/generator is configured to function as a generator for converting excess mechanical power from the gas turbine into electrical power and delivering the electrical power to the electric power grid, and as a motor for supplementing driving power to the compressor. 2. The drive system of claim 1, wherein the electric motor/generator is arranged at the cold end of the gas turbine and the load coupling is arranged at the hot end of the gas turbine. 3. The drive system of claim 1, further comprising a mechanical fuse between the electric motor/generator and the gas turbine. 4. The drive system of claim 1, further comprising a clutch between the electric motor/generator and the gas turbine. 5. The drive system of claim 1, wherein the electric motor/generator is permanently connected to the cold end or the hot end of the gas turbine. 6. The drive system of claim 1, wherein the electric motor/generator is further configured to function as a starter to start up the gas turbine and the load. 7. The drive system of claim 1, wherein the gas turbine is a single-shaft gas turbine. 8. The drive system of claim 1, wherein the gas turbine is a dual-shaft gas turbine and comprises: a core comprised of a high-pressure compressor and a high-pressure turbine connected by a first shaft;a starter for starting the core;a low-pressure compressor; anda low-pressure turbine,wherein the low-pressure turbine and the low-pressure compressor are connected by a second shaft extending from the hot end to the cold end of the gas turbine, andwherein load is mechanically connected to the second shaft at one of the hot end and the cold end of the gas turbine and the electric motor/generator is mechanically connected at the second shaft at the other one of the hot end and the cold end of the gas turbine. 9. The drive system of claim 1, further comprising a frequency converter connected between the electric motor/generator and the electric power grid, the frequency converter configured and controlled for conditioning the electric frequency from the electric power grid to the electric motor/generator and from the electric motor/generator to the electric power grid. 10. The drive system of claim 1, wherein the electric motor/generator is arranged at the cold end of the gas turbine and the load coupling is arranged at the hot end of the gas turbine. 11. The drive system of claim 10, further comprising a mechanical fuse between the electric motor/generator and the gas turbine. 12. The drive system of claim 11, further comprising a clutch between the electric motor/generator and the gas turbine. 13. A method of starting a system comprised of a gas turbine and a load, the method comprising: providing the gas turbine with a hot end and a cold end;coupling a load to one of the hot end and the cold end;coupling an electric motor/generator to the other one of the hot end and the cold end;switching the electric motor/generator in a motor mode; andelectrically powering the electric motor/generator and converting electric power into mechanical power in the electric motor/generator and using the mechanical power for starting-up the gas turbine and the load, the mechanical power transferred from the electric motor/generator to the load through the gas turbine,wherein the load comprises a compressor. 14. The method of claim 13, further comprising: coupling the electric motor/generator to the cold end of the gas turbine; andcoupling the load to the hot end of the gas turbine. 15. A method of operating a gas turbine system comprised of a gas turbine and a load driven by the gas turbine, the method comprising: providing the gas turbine with a hot end and a cold end;coupling a load to one of the hot end and the cold end;coupling an electric motor/generator to the other one of the hot end and the cold end, and mechanically coupling the electric motor/generator to the load;generating mechanical power by the gas turbine;powering the load with the mechanical power generated by the gas turbine; andwhen the mechanical power generated by the gas turbine exceeds the mechanical power required to drive the load: operating the electric motor/generator in a generator mode;transferring excess mechanical power from the gas turbine to the electric motor/generator; andconverting the excess mechanical power into electric power in the electric motor/generator,wherein the load comprises a compressor. 16. The method of claim 15, wherein: when the mechanical power generated by the gas turbine is less than the power required to drive the load, the method further comprising:operating the electric motor/generator in a motor mode;electrically powering the electric motor/generator;converting electric power into supplemental mechanical power in the electric motor/generator;transferring the supplemental mechanical power from the electric motor/generator through the gas turbine to the load; anddriving the load with combined power generated by the gas turbine and supplemental mechanical power generated by the electric motor/generator. 17. The method of claim 15, further comprising: coupling the electric motor/generator to the cold end of the gas turbine; andcoupling the load to the hot end of the gas turbine.